.postfix-center {
    text-align: center;
}

.advanced {
    font-size: 1.25em;
    font-weight: 100;
    padding-bottom: 10px;
    justify-content: center;
}

#input {
    width: 50vw;
    max-width: 500px;
    min-width: 250px;
    border: 1.5px solid rgb(0,0,0);
    font-size: 1.25em;
    text-align: center;
}

#calculate {
    width: 150px;
    font-size: 1.4em;
    background-color: rgb(200,200,200);
    border: none;
}

#output {
    font-size: 1.25em;
}